1, first open the first window, open the use of hands, a hand-pull child safety lock pin, one-handed rotary handle to make it easy to open. 2. When you open the second fan, both hands rest on the middle of the two sides of the window sash respectively. When you open the window to the side, you can open the door next to it. 3. The opened sashes must be fixed with bolts to prevent wind and children from colliding with each other and causing damage to the glass when violent shaking occurs. 4. When wiping the window sash facade, the sash must be opened at 90 degrees. Clean the glass with a glass cleaner, soft cloth or wiper to keep the window sash clean and bright. 5, to protect the seal between the sash, if there is stains and dust, use a soft cloth dipped in water or alcohol wipe. Knowledge of building materials, doors, windows, doors, windows, glass doors
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